Post on 02-Jan-2017
Variability Modelling in the ABS Language
Dave ClarkeKatholieke Universiteit Leuven
based on joint work with José Proença, Michiel Helvenstijen,
Ina Schaefer, Radu Muschevici
Tuesday 1 March 2011
Outline
• Introduction
• Feature Modelling
• Delta Modelling
• Product Line Configuration
• Feature Selection
• Product Generation
• Conclusion
Tuesday 1 March 2011
Outline
•
• Feature Modelling
• Delta Modelling
• Product Line Configuration
• Feature Selection
• Product Generation
• Conclusion
Introduction
Tuesday 1 March 2011
Product Line Development
Feature Model Family Engineering
Product Line Artefacts Base
Application EngineeringFeature Selection Product
Tuesday 1 March 2011
Running Example
Tuesday 1 March 2011
Running Example:Multi-lingual Hello World• English: “Hello World”
• German: “Hallo Welt”
• Dutch: “Hallo Wereld”
• Swedish: “Hejsan Allihopa”
• French: “Bonjour tout le monde”
• Possibly with repetition
Tuesday 1 March 2011
Ingredients of Variability in ABS
• Core ABS
• Feature Model (µTVL) – describing variability
• Deltas – implementing variability
• Configuration Language
• Feature Selection Language
Tuesday 1 March 2011
The Core Functionality
Tuesday 1 March 2011
The Core
interface Greeting { String say_hello();}
class Greeter implements Greeting { String say_hello() { return "Hello world"; }}
English by default
A fully functioning application(minus main)
Tuesday 1 March 2011
Outline
• Introduction
•
• Delta Modelling
• Product Line Configuration
• Feature Selection
• Product Generation
• Conclusion
Feature Modelling
Tuesday 1 March 2011
Product Line Development
Feature Model Family Engineering
Product Line Artefacts Base
Application EngineeringFeature Selection Product
Tuesday 1 March 2011
Feature Models
I18n
Repeattimes:[1,1000]
GermanFrench
English
SwedishRepeat → (times ≥ 2
&& times ≤ 5)
Or CardinalitiesExcludesRequires
Optional
Alternative
ConstraintsAttributes
And
Tuesday 1 March 2011
Feature Model in µTVLsroot I18n { group allof { Language { group oneof { English, Dutch, French, German, Swedish } }, opt Repeat { int [0,1000] times; } }}
extension English { ifin: Repeat ->
(Repeat.times >= 2 && Repeat.times <= 5);}
Tuesday 1 March 2011
µTVL Feature Modelling Language
• µTVL adapts existing TVL language [Claessen, FUNDP, Namur U]
• Constraint solver written in Choco:
• finds valid feature selections matching specified constraints
• checks validity of feature selections
Tuesday 1 March 2011
Outline
• Introduction
• Feature Modelling
•
• Product Line Configuration
• Feature Selection
• Product Generation
• Conclusion
Delta Modelling
Tuesday 1 March 2011
Delta-oriented Programming
Feature Model Family Engineering
Product Line Artefacts Base
Application EngineeringFeature Selection ProductAutomated Product
Derivation
Core Products –complete product for some feature configuration
Product Deltas –additions, removals, modifications to core product
Tuesday 1 March 2011
Delta-oriented Programming
• Modifications on Class Level:
• Addition, Removal and Modification of Classes
• Modifications of Class Structure:
• Changing Super Class and Constructor
• Adding/Removing Fields/Methods
• Modifying Methods (wrapping original call)
- [Delta-oriented Programming of Software Product Lines Schaefer, Bettini, Bono, Damiani, Tanzarella. SPLC 2010.]
Tuesday 1 March 2011
The Repeat Delta
delta Rpt (Int times) { modifies Greeter { modifies String say_hello() { String result = ""; Int i = 0; while (i < times) { result = result + original(); i = i + 1; } return result; } }}
Tuesday 1 March 2011
The German Delta
delta De { modifies Greeter { modifies String say_hello() { return "Hallo Welt"; } }}
Tuesday 1 March 2011
The Dutch Delta
delta Nl { modifies Greeter { modifies String say_hello() { return "Hallo wereld"; } }}
Tuesday 1 March 2011
The French Delta
delta Fr { modifies Greeter { modifies String say_hello() { return "Bonjour tout le monde"; } }}
Tuesday 1 March 2011
The Swedish Delta
delta Sv { modifies Greeter { modifies String say_hello() { return "Hejsan allihopa"; } }}
Tuesday 1 March 2011
Outline
• Introduction
• Feature Modelling
• Delta Modelling
•
• Feature Selection
• Product Generation
• Conclusion
Product Line Configuration
Tuesday 1 March 2011
Features-Delta Mapping
Deltas
Core
Artefacts
Feature Model
Configuration
application conditions & delta ordering
Tuesday 1 March 2011
Configuration
• Links feature model with deltas
• Adds application conditions to deltas:
• constraints on features and attributes
• Specifies ordering between deltas
• Nests deltas to ensure atomic application
Tuesday 1 March 2011
Configuration
product line HelloMultiLingual { features Repeat, German, French, Dutch, Swedish; core English;
delta De when German && not Repeat; delta Fr when French; delta Nl when Dutch; delta Sv when Swedish && Repeat; delta Rpt(Repeat.times) after De, Fr, Nl, Sv when Repeat;}
parameter passing
ordering
application conditions
Tuesday 1 March 2011
Outline
• Introduction
• Feature Modelling
• Delta Modelling
• Product Line Configuration
•
• Product Generation
• Conclusion
Feature Selection
Tuesday 1 March 2011
Product Line Development
Feature Model Family Engineering
Product Line Artefacts Base
Application EngineeringFeature Selection Product
Tuesday 1 March 2011
Feature Selection
Deltas
Core
Artefacts
Feature Model
Configuration
Satisfies
Product
Uses Uses
Generates
Feature Selection
Tuesday 1 March 2011
Feature Selection
• Specifies selected features and their attributes.
• Final Ingredient required to Generate Product.
• Checked against Feature Model.
Tuesday 1 March 2011
Feature Selection
// basic product with no deltasproduct P1 { Greeting bob; bob = new Greeter(); String s = ""; s = bob.say_hello();}
} Initialisation (aka main)
Tuesday 1 March 2011
Feature Selection
// apply delta Fr and Repeatproduct P3 (French, Repeat{times=10}) { Greeting bob; bob = new Greeter(); String s = ""; s = bob.say_hello();}
Attribute SpecificationFeature Selection
Tuesday 1 March 2011
Outline
• Introduction
• Feature Modelling
• Delta Modelling
• Product Line Configuration
• Feature Selection
•
• ConclusionProduct Generation
Tuesday 1 March 2011
Product Line Development
Feature Model Family Engineering
Product Line Artefacts Base
Application EngineeringFeature Configuration Product
Tuesday 1 March 2011
Product Generation
• For a Feature Configuration:
• Select product deltas with valid application condition
• Determine linear ordering of product deltas compatible with partial ordering
• Apply changes specified by product deltas to core product in the linear order
Tuesday 1 March 2011
Given Feature Selection
// apply delta Fr and Repeatproduct P3 (French, Repeat{times=10}) { Greeting bob; bob = new Greeter(); String s = ""; s = bob.say_hello();}
Tuesday 1 March 2011
Apply Delta Frclass Greeter implements Greeting { String say_hello() { return "Hello world"; }}
delta Fr { modifies Greeter { modifies String say_hello() { return "Bonjour tout le monde"; } }}
+
Tuesday 1 March 2011
Apply Delta Fr
class Greeter implements Greeting { String say_hello() { return "Bonjour tout le monde"; }}
Tuesday 1 March 2011
Configure Repeat
delta Rpt (Int times) { modifies Greeter { modifies String say_hello() { String result = ""; Int i = 0; while (i < times) { result = result + original(); i = i + 1; } return result; } }}
times=10
Tuesday 1 March 2011
Configure Repeat
delta Rpt { modifies Greeter { modifies String say_hello() { String result = ""; Int i = 0; while (i < 10 ) { result = result + original(); i = i + 1; } return result; } }}
Tuesday 1 March 2011
Apply Repeat
delta Rpt { modifies Greeter { modifies String say_hello() { String result = ""; Int i = 0; while (i < 10) { result = result + original(); i = i + 1; } return result; } }}
class Greeter implements Greeting { String say_hello() { return "Bonjour tout le monde"; }}
+
Tuesday 1 March 2011
Apply Repeatclass Greeter implements Greeting { String __say_hello_original() { return "Bonjour tout le monde"; }
String say_hello() { String result = ""; Int i = 0; while (i < 10) { result = result + __say_hello_original(); i = i + 1; } return result; }}
Tuesday 1 March 2011
Adding Initialisationclass Greeter implements Greeting { String __say_hello_original() { return "Bonjour tout le monde"; }
String say_hello() { String result = ""; Int i = 0; while (i < 10) { result = result + __say_hello_original(); i = i + 1; } return result; }}{ Greeting bob; bob = new Greeter(); String s = ""; s = bob.say_hello();}
Tuesday 1 March 2011
Typing Issues
• Errors
• Field, method, class missing
• Incorrect type: field/method
• Warnings
• Field/method/class not expected one
• Conflicting implementation orderings
• Product line level checking instead of per product (= after generation) checking
Tuesday 1 March 2011
Outline
• Introduction
• Feature Modelling
• Delta Modelling
• Product Line Configuration
• Feature Selection
• Product Generation
• ConclusionTuesday 1 March 2011
HATS ABS
• HATS ABS is a collection of 5 languages
• Core Product
• Product Deltas
• Feature Modelling
• Configuration: Links FM and Core+Deltas
• Feature Selection
• Implementation efforts are well underway
Tuesday 1 March 2011
Questions?
Tuesday 1 March 2011